.banner_container {
    width: 100%;
    height: 480px;
    position: relative;
}

.banner {
    width: 100%;
    height: 480px;
    position: absolute; /* 让banner不占文档流，这样就不会影响后面的元素 */
}

.banner img {
    width: 100%;
    height: 480px;
    position: absolute;
}

.banner_container .inner_c {
    position: relative;
    height: 480px;
}

.banner_container .btns {
    width: 100px;
    height: 10px;
    position: absolute;
    bottom: 10px;
    left: 795px;
}

.banner_container .btns li {
    width: 8px;
    height: 8px;
    border-radius: 5px;
    border: 1px solid #eeeeee;
    float: left;
    margin-right: 10px;
}

.banner_container .btns li.current {
    background: #008cff;
}

.banner_container .categories {
    position: absolute;
    top: 0;
    padding: 40px 0 40px 20px;
    width: 220px;
    background: #eeeeee;
}

.banner_container .categories li {
    height: 50px;
    line-height: 50px;
}
